Ndyabawe, Kenneth, and William S. Kisaalita. 2014. “Validity of the Africa-Wide Lang Factor of 2.63 for Estimating Small Biogas Plant Installation Costs in Uganda”. International Journal of Agricultural and Biological Engineering 7 (1):70-76. https://www.ijabe.migration.pkpps06.publicknowledgeproject.org/index.php/ijabe/article/view/880.